There isn't enough information provided in this bug report to be certain (p.s. use 'ubuntu-bug xorg' when reporting X bugs!) however this smells a lot like a kernel bug to me. I'm refiling as 'linux'.
I would suggest re-testing against the current development version (natty) and filing bugs via the above command, which will ensure the necessary debug data is collected.
There isn't enough information provided in this bug report to be certain (p.s. use 'ubuntu-bug xorg' when reporting X bugs!) however this smells a lot like a kernel bug to me. I'm refiling as 'linux'.
I would suggest re-testing against the current development version (natty) and filing bugs via the above command, which will ensure the necessary debug data is collected.